package chapter04.Example14;
abstract class Animal{
   abstract void shout();
}

class Cat extends Animal{
    void shout(){
        System.out.println("喵~喵~喵~");
    }
}
class Dog extends Animal{
    void shout(){
        System.out.println("汪汪汪......");
    }
}
public class Example14 {
    public static void main(String[] args){
        Animal cat = new Cat();
        Animal dog = new Dog();
        cat.shout();
        dog.shout();
    }
}
